Augustine of Hippo
Catena Aurea · Matthäusevangelium 6
And forgive us our debts, as we forgive our debtors.
(Enchir. 73.) Forasmuch as this so great goodness, namely, to forgive debts, and to love our enemies, cannot be possessed by so great a number as we suppose to be heard in the use of this prayer; without doubt the terms of this stipulation are fulfilled, though one have not attained to such proficiency as to love his enemy; yet if when he is requested by one, who has trespassed against him, that he would forgive him, he do forgive him from his heart; for he himself desires to be forgiven then at least when he asks forgiveness. And if one have been moved by a sense of his sin to ask forgiveness of him against whom he has sinned, he is no more to be thought on as an enemy, that there should be any thing hard in loving him, as there was when he was in active enmity.